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Category:   Application (Forum/Board/Portal)  >   WordPress Vendors:   wordpress.org
WordPress Input Validation Flaw in Processing Large Comments Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1032199
SecurityTracker URL:  http://securitytracker.com/id/1032199
CVE Reference:   CVE-2015-3440   (Links to External Site)
Updated:  Apr 28 2015
Original Entry Date:  Apr 27 2015
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 4.1.1, 4.1.2, and 4.2 (and prior)
Description:   A vulnerability was reported in WordPress. A remote user can conduct cross-site scripting attacks.

The system does not properly filter HTML code from user-supplied input in Comments before displaying the input. A remote user can submit a specially crafted and long comment that, when viewed by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the WordPress software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A comment larger than the MySQL TEXT type size limit of 64 kilobytes will result in a truncated comment with malformed HTML to trigger this vulnerability.

A demonstration exploit comment is provided:

<a title='x onmouseover=alert(unescape(/hello%20world/.source))
style=position:absolute;left:0;top:0;width:5000px;height:5000px
AAAAAAAAAAAA [64 kb] ...'></a>

The original advisory is available at:

http://klikki.fi/adv/wordpress2.html

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the WordPress software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The vendor has issued a fix (4.2.1).

The vendor's advisory is available at:

https://wordpress.org/news/2015/04/wordpress-4-2-1/

Vendor URL:  wordpress.org/news/2015/04/wordpress-4-2-1/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents



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